package com.zzyl.framework.config;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;
import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONReader;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.filter.Filter;
import com.zzyl.common.constant.Constants;

/**
 * Redis使用FastJson序列化
 * 
 * @author ruoyi
 */
public class FastJson2JsonRedisSerializer<T> implements RedisSerializer<T>
{
    public static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;

    static final Filter AUTO_TYPE_FILTER = JSONReader.autoTypeFilter(Constants.JSON_WHITELIST_STR);

    private Class<T> clazz;

    public FastJson2JsonRedisSerializer(Class<T> clazz)
    {
        super();
        this.clazz = clazz;
    }

    @Override
    public byte[] serialize(T t) throws SerializationException
    {
        if (t == null)
        {
            return new byte[0];
        }
        return JSON.toJSONString(t, 
            JSONWriter.Feature.WriteClassName,
            JSONWriter.Feature.FieldBased,
            JSONWriter.Feature.IgnoreErrorGetter,
            JSONWriter.Feature.WriteMapNullValue,
            JSONWriter.Feature.WriteNullListAsEmpty,
            JSONWriter.Feature.WriteNullStringAsEmpty,
            JSONWriter.Feature.WriteEnumsUsingName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException
    {
        if (bytes == null || bytes.length <= 0)
        {
            return null;
        }
        String str = new String(bytes, DEFAULT_CHARSET);

        try {
            // 首先尝试使用自动类型过滤器解析
            return JSON.parseObject(str, clazz, AUTO_TYPE_FILTER,
                JSONReader.Feature.SupportAutoType,
                JSONReader.Feature.FieldBased,
                JSONReader.Feature.UseBigDecimalForDoubles,
                JSONReader.Feature.AllowUnQuotedFieldNames);
        } catch (Exception e) {
            try {
                // 如果第一次解析失败，尝试不使用自动类型过滤器
                return JSON.parseObject(str, clazz,
                    JSONReader.Feature.SupportAutoType,
                    JSONReader.Feature.FieldBased,
                    JSONReader.Feature.UseBigDecimalForDoubles,
                    JSONReader.Feature.AllowUnQuotedFieldNames);
            } catch (Exception ex) {
                // 如果仍然失败，记录错误并返回null
                throw new SerializationException("Cannot deserialize: " + str, ex);
            }
        }
    }
}